Carburetor



Dec 18, 1951 R. H. SUMPTER ETAL 2,578,857

CARBURETOR Filed May 12, 1949 RUDOLPH H., SUMPTER,

ELMER S. .SuMPrE/2,

INVENToRs:

Patented Dec. 18, 1951 UNITED STATES cargar' oFFlcE Rudolph H. `Sumpter amirlmerfS. Summer,

Hollywoodalif-.if I 1 Application May 12, 1949, Serialltlo. 92,796

1 claim.- (o1. 26144.11

This invention relates generally to the class of ngas and vlliquid contact apparatus and is `directedparticularly to improvements in carburetors --of the type used in connection with internal combustion engines.

A principal object of the present inventionis to provide animprovedmotor vehicle engine carburetor which is designed primarily for use in connection with the engines of racing vehicles and which `functions to immediately provide the required fuel upon the opening of the control f throttle, thereby eliminating the need of the usual "and commonly employed acceleration pump.`

- Another object of the invention is `to provide an improved internal combustion engine carburetor in which the usual butterfly valve is eliminatedv and'wherein the fuel feed is associated withthe control or throttle valve to instantly supply therequired amount of fuel upon the opening of the valve, as above set forth, and wherein the devicebecomes a true full range carburetor.

- VStill another object of the invention is to provide 1a full range carburetor structure wherein the usualVenturi structure forming a partv of the conduit leading to the engine intake manifold, is made a part ofthe control or throttle valve and the fuel feed or fuel nozzle .opens into the reduced or restricted area of the venturi.

Another object. of the invention is to provide in .a carburetor of thecharacter set'forth, a Venturi. throttle valve which is so designed thatthe vacuum is continuous in the venturi as a result of which there is no receding of the fuel Within the venturi `which causes the usual lag or gasp in other types of carburetors when the throttle is opened. f

Other objects andadvantages of the invention will become apparent as the; description of the same proceedsand the invention will be best understood from a consideration of the following detailed description taken in connection with the accompanying drawingI forming a partofthe specification, with the understanding,l however, that the invention is not to belimited to the exact details of construction shown and described since obvious modifications will occur to 'a persontskilledin theart.

In the drawing:

Figure 1 is a4 view partly in elevation and'A part- 1y in vertical section of a carburetor structure constructed in accordance with an embodiment of the present invention.

Figure 2 is a horizontal section taken substantially on the line 2-2 of Figure 1.

Figure 3 is a detail section corresponding to Figure 2= but showing the venturi throttle in fully c'lo'scdposition.`

Referring now more particularly to the drawing-the numeral It generally designates the tubular bodyvportion of the carburetor structure which has `the opposite end flanges II and I2 by which the structure is secured in position between the air intake orV filter and the intake manifold.

In the illustration of thestructure the numeral I3 1designates theair supply pipe which may lead from ltheusual lter while the numeral I4 designatesth'eA intake for the fuel intake manifold, such intake Ibeingfianged as indicated at I5 and havinga fiange I2 of the carburetor secured thereto by bolts I6. The air intake pipe I3 is also "anged'as indicatedat I1 and has the carburetor -iiange I l-connected thereto by cap screws orr bolts IB as shown; However, if desired, the airlinta'ke vI3 may-be'eliminated whereby the air is taken directly from the atmosphere into the carburetor tube body I0.

VVIntermediateitsends the body I 0 is suitably enlarged as indicated atl-9 and such enlarged portion has formed therethrough diametrically of the'tu'be Hl,` the-cylindrical valve chamber 20 which opens at `one end through the wall of the body Y"and is dened at v`the open end by the annularfface ZI rupon -whichis fixed, by means of machine-screws 22,'a cover cap 23. This cap 23 has a central passage 24 therethrough for the purpose about to be described.

Atthe opposite side of the body from the open end Vof ,the circular chamber or bore 20, the body has formed integraltherewith the radially outwardly extending` circular hub 25 which has an axial; borei formed therethrough, which is concentric withthe chamber 2 0.v The outer end of thisbore 2E is of slightly enlarged diameter as indicatedat a and fixed inthe bore 26 in the part of x'smaller diameter which is at the inner end of the hub, is the tubular fuel supply nozzle 21 which extends axially' into vthe chamber and has itsi open inner-end laat approximately the axialceterof the tubular body I0 or, in other words,' a t theV axial ,center of the fuel conducting conduit formed vthrough the body Ill and leading to theintake'lmanifold 'I 4.'

. vThe,,numeral12.8 'generally designates the fioat bowllintcwhichthe fuel is conducted by way of the pipe`line`29` and in which. is the usual oat 3B which controls the in-iiow of fuel to the bowl in the customary manner. This part of the carburetor structure is of conventional design and 3 accordingly no detailed illustration or description of the same is believed to be necessary. It will be readily seen that the fuel may pass from the bowl by way of the port 3| to the outer end of the bore 26 and from there to the tube or nozzle 21 as required in response to the reduction of pressure in the intake manifold.

The numeral 32 generally designates the throttle valve which is in the form of a barrel which fits snugly in the cylindrical chamber 20 to rotate therein on an axis extending perpendicular to the tubular body i0. This barrel has formed transversely therethrough the passage 33 which at its two ends is of the same diameter as the passage or bore Illa formed through theA body i0.

The passage 33 is constricted substantially midway of its ends to form the venturi 34, the narrowest portion b of which is at the longitudinal center of the passage 33 as shown.

Formed integral with the barrel 32 midway of its ends and extending axially therefrom is a pivot trunnion 35 and directly opposite from this trunnion the barrel has the axially7 directed opening 3S formed therethrough through which the fuel nozzle 21 passes to the center of the narrow portion b of the venturi.

The trunnion 35 passes through the opening 24 of the cap 23. Thus it will be seen that the barrel 32 rotates on the trunnion and the fuel nozzle 21 to bring the barrel passage 33 into axial alignment with the passage vlila of the body l or at any desired angle with respect thereto.

The outer end of the trunnion 35 carries a suitable lever 31 with which is connected the throttle rod 38.

On the intake manifold side of the barrel the wall of the passage lila where it merges with the curved wall of the cylinder bore 20, at one side, is provided with an idling jet slot 39 which, as is shown in Figures 2 and 3, extends into the curved portion of the bore 20 and also to some distance lengthwise of the wall of the passage lila. Leading into this slot 39 at the lower side thereof is a relatively small fuel supply passage 40 which at its opposite end opens into the float bowl 28 as shown in Figure 1. The outlet end of the passage l0 is reamed to provide the tapered seat 4| into which is adapted to enter the point of a needle valve l2 which, asA shown in Figure l, is accessible from the outside of the carburetor body for necessary adjustment.

At the side of the barrel 32 opposite from the idling jet opening 39 the edge of the passage 33 is cut down by ling or otherwise reducing the material of the barrel as indicated at.43 to provide an air passageway through the venturi and across the idling jet opening 39 even though the passage 33 may be set exactly perpendicular to the axis of the body passage Illa. as shown in Figure 3. By this means the necessary supply of air is provided for maintaining the operation of the engine at idling speed.

From the foregoing it will be seen that in the present invention the usual throttle valve or butterfly valve control is eliminated and the control or throttle valve, the venturi and the main fuel spray jet have been combined in one unit. This provides for the full opening of the carburetor passage leading to the intake manifold from the minimum passage opening thereby providing a true full range carburetor.

In addition to the foregoing the need for the customary acceleration pump is eliminated since the novel construction of the present carburetor avoids or overcomes the usual lag between the motors demand for fuel and the answering of such demand by the opening of the carburetor control valve. Also by combining the throttle and venturi in one unit and pivoting the venturi above the spray nozzle as shown, improved turbulence is acheived at all opening positions of the valve which increases the efciency of the fuel mixture at all speed ranges.

We claim:

In a carburetor structure, an elongated hollow body open at both of its ends and having cylindrical end portions and a laterally enlarged intermediate portion, annular iianges at the ends of said body for its interconnection with and between an air intake arid a mixture intake manifold, the interior of said intermediate portion being cylindrical and open at one end, a closure plate for the open end of said intermediate portion, a hub-like part projecting outwardly from the center of the opposite end of said intermediate portion and having a central bore opening Alengthwise through the same into the interior of the latter, a cylindrical throttle valve within said intermediate portion and having a bore of Venturi form extending diametrically through the same, a trunnion projecting from a side of said valve and projecting outwardly through an opening formed centrally in said closure plate, a fuel injector tube mounted in the first bore and projecting into the center of the narrower portion of the second bore through an opening formed in the opposite side of said valve in line with said trunnion and acting with the latter to allow turning movements of the valve, a casing of bowllike form clampingly secured on said body and enclosing said hub-like part, an annular float within said casing and loosely surrounding said hub-like part, a fuel intake opening through the axial center of said casing, said float being adapted to control the ingress of fuel from the intake thereof, an idler fuel intake jet opening into said body at the mixture output end of said valve, and a needle valve for regulating the fuel discharge from said jet, said throttle valve having an air intake port at its air intake end to pass air through the bore therein for mixing with the fuel admitted from said idler jet, when it isfully closed. i

RUDOLPH H. SUMPTER. ELMER S. SUMPTER.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,409,420 Speed Mar. 14, 1922 1,737,496 Feroldi Nov. 26, 1927 FOREIGN PATENTS Number Country Date 293,789 Great Britain May 18, 1928 21,510 France July 20, 1920 609,6844 France May 17, 1926 

